When building overviews for a mosaic raster dataset, statistics are automatically calculated.
When statistics are present for a raster, clipping is automatically applied making the image look overblown and unnatural.
In ArcMap, you could remove statistics as outlined in this article:
https://desktop.arcgis.com/en/arcmap/latest/manage-data/raster-and-images/removing-statistics.htm
Doing this removes the automatic clipping and images return to their natural looking state.
Currently, it is impossible to remove statistics from a raster in ArcGIS pro. Please implement statistics removal in ArcGIS pro so that I do not need to use ArcMap to do it. Until this feature is implemented, I will need to continue to use ArcMap to remove statistics. If you want everyone to migrate to Pro, be sure you have the complete functionality of ArcMap, ESRI!